3-axis ballhead mini tripod thingie (aka. the tennisball-pod)

Step 2 Make the ball

using the knife or a corkscrew make a hole in the tennis ball that's large enough to squeeze the head of the nut through. It should best be a tight fit. You could make an X like I did but I don't recommend it, because there is a loss in stability when you do it like this.

Insert the bolt into the hole, put a washer on it and screw it down in place with the nut. Make it as tight as you can. This should securely hold the bolt in place.